refactor(agent): drop vestigial install_configured param, non_empty_env helper, explicit infallible expect in client

hive-ag3nt/src/plugins.rs

@@ -11,8 +11,6 @@
 //! plugin specs resolve against current index data. Marketplace update
 //! failures are non-fatal — stale index is better than no install attempt.
 
-use std::path::Path;
-
 use tokio::process::Command;
 
 const PLUGINS_PATH: &str = "/etc/hyperhive/claude-plugins.json";
@@ -103,8 +101,7 @@ async fn update_marketplaces() {
 /// notification, see `Surface::send_to_parent`). Wire-agnostic: the
 /// caller picks the recipient via the same `<parent>` sentinel that
 /// failure-notify uses everywhere else.
-pub async fn install_configured(socket: &Path) -> Vec<String> {
-    let _ = socket; // Reserved for future telemetry; currently unused.
+pub async fn install_configured() -> Vec<String> {
     let Ok(raw) = tokio::fs::read_to_string(PLUGINS_PATH).await else {
         return Vec::new();
     };